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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ca4dfc54dda39f71537973c9f0c0a7668ef160153fb2a4e204ca4ba1d2df49' 
  AND token = 'x+D0SJFEe6JWfQUVQB9uvq1QEM5kojuE4s0J73hZySQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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