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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd66c4bd7c8fa01fbb0b1366ca6f1333328e9fca169d28f7c8a04173df404933' 
  AND token = 'OWSJdkwEw7yEG3Wq+nspv+SPnPy9FmwKsfQjOevUDfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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