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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6e85ee1af5d2853150da26b5e15cc994918a76d441ec3012e744327820dd8c' 
  AND token = 'Qk3vaip0qV84iEhrkp/fyDGxl8SMDzEQ5Nxv08SFJgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}