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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89d126c4a7884c2795d7218b21d030818e7da230cd589c3b2ec02585821d762' 
  AND token = 'J2qK3VWKgDYZCt5nTFeY8w0vbR1r7SfcON/ri2uQ3oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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