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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4eef3ad3c898f239f69788bd55aad1a9af1288e830b3498815eb319018cd69' 
  AND token = 'aiTJrYaQ6ek5dhbkeVxdXv02nF+esY9Yc7zFIpFhqi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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