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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7093b7e074464fcd5b54e9a027c19c4cd01ccea0e5fc2292c5d021ab8cdb8fac' 
  AND token = '8hywaUisgFE/imJnRwpz6M0QpGtnR4ai9rHxR6D0TR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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