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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c5e8d78ef9bfeadbae770a4ae30454636fb6139fce402595f153a33d2ca4dc' 
  AND token = '8nAwmvEu52Mz919YBFXjJ7bKIOFSi4mF2KtMrOMIQlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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