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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3a61f62d5039a94bd7e6b70ba01d5aeab01923c6fec60290d93fe3c0038228' 
  AND token = '+lYVtxzYbfvJJz6rbSYrH+itKjN/oqw0D9H3Hll1xUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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