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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae2bd2089ef5d79a2da0b69e2057116e262977c94d3ee2ca505cf1d4e78bb06' 
  AND token = 'BQVkELiDVv3c+nvpU/i4q2UG06m6q1e49RrXVkU2Guw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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