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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39e096ab5e656f551399b2dfd0f81d4b7f270b8a4ded8907168d8a64daf5425' 
  AND token = 'SJJ3S26EonMUiRB6iFgtvWSTuVmQoxY07j2oA+hjsEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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