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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0de84ff7df8bdef614403df90da20e2ee85b2ae2d498ef7676933294a6df658' 
  AND token = 'P6UhDT8hgk062h+01WiKAnPF/rDRgXChcPLcdzOlNrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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