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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ba9cc9d2366a709c72e2bdeef498e8c94665d7094501779286c45b4aa474f2' 
  AND token = '/APA8NYBx+eDObGYQKQg2aQ1RZjILD3Ew3lTbxp1AFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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