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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe922e793336aab9589645d9a9d2893760b9a48182e1c85749bb1e6cc387799' 
  AND token = 'rkS9InN/8qcLB5dvN5eTyDKd01xpCOtANv1QoXkMD9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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