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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2328afc93c51a9340a806db403499b56207bca875c18ed1e38f2bc34130bfeb' 
  AND token = 'TfJ3WZNutmtJb+ra3rGK92OXWC8WTL+VDvvm9ZGPp+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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