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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb81e2f4d848957253c0622626e578a010ee7c11c962962fbae9c75f59a0af13' 
  AND token = 'jPmBNguiYt0SucY/MAvxq7qT6swWvtuzyQEqHt2xe4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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