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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb548266a388a4ca73b8a7ad0408cf88050bb12305e266ae4b7d4a37e2f864b0' 
  AND token = 'yTBfGfEJnATCyjJfvF+RKg9B0fi4onZwhKx5JLQYnu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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