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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c67e9a574ed5e69267e43ac349f686769ec154d7c7b5cd08b51662c4ff858b0' 
  AND token = 'A0T9Lo3rFFaYEIpLN0OiCXFy/87A06EOPmUtLCyAD14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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