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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bbbfe6681411d752949794222974af9aad836e38349899ed3ee85b1215585b' 
  AND token = 'nTUqlO166Vvm9FINuRqmTJVDMdCoOrecneFbZvjjbxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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