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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac73256879dfc0540855f34b6c0ca379800db7e93096c0e9ea4911db13edbcc' 
  AND token = 'oWzX4rE0CXMa5ZU+AZlVPefeSyYgNlX5s/PsIsYVGuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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