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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6fefd4feca667b6a5e8210e2c4ad21a18de892ce1c13f370f2fcd9d8b63f7b' 
  AND token = 'cKJAXX32OHdXv0wUPqdLbffsjKIe+MMDH9gac9j7TWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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