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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3152fb2ede54bad51f3c1e6582c5a32d198054774ae2125b6bb764f5ab807c' 
  AND token = 'UqnIQVYOEmACh3sGCu+fjhPdRPfs4U+8j6ufhcbwhO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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