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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac1bcc36748b3d7007b6dd13469dbdb5076de5c96293743d67db868d35cdf13' 
  AND token = 'me/Ocri8Qo4VPNLEkWgIYlccEbfOn7JhlakRBis4qkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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