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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ee9c87edc30ef26ded26b28deeb41539807cf60024973aa6b04e74cc44daa2' 
  AND token = '9UP1jvP++HoWm3RPkRJrjdkl/wCNA0xY0Xvx7bkRJO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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