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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f127bfd5d3dccab4215714dbd5e6f5b79f6add4e502e7395cc6a3661ce11e6' 
  AND token = '3Hk/GFijn13Uw/rOsZEXfI9tNZzIhS4HU6E06Omtu/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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