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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e100c2ba7c1c5ac92e1b160673932fc2a6974b78f73ad0a5521cd00286cb0b' 
  AND token = 'MqBjJHBrE+XWMNN51I13HUm9MVShJky1CqTNX63+yZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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