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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2629542f2e3f0b1d14d0e6e78fe70d4b39ac0344dcbcbfb8150dc930e3466e5' 
  AND token = 'pPALWA+fX5eJw1LiyEaALOjCogO7Gf8LaL24ypDkeao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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