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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99519038bd0b5ac9ce4772834e68b33a5aed51f5bd86e86649ec34a3d85a041c' 
  AND token = '58/oPq3wC9jHyQCUj2s2ZyhwtIEJj0lEhdVcykZyS8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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