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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696aa5a407862d05f6a52fa4359a243cfc19071bcf953043c06128e60304029a' 
  AND token = 'mLIVo7tObCzFSnDZHX8D2Axt7/QJ17wpiu+8VjXCVF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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