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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb42c82accb0255da9105ddd91e672c86a3ec6e6b822993aa2d90835eebfaf5' 
  AND token = 'NkQ8o0lQUZxwHyssVqJgCuGicby0kPIE4uQ5h6CUbdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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