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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cd85a329972259490eb9aab5b9b053e73927431f502fd8999ed9000d6b41a5' 
  AND token = 'HDHX60FZVdqwQgeAtgr8P522YU1Td3TAN6SKNWczaZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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