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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b2319894d94b10dbc9d0b387febf5aca17e6202212cf13bf489c6509d1bd87' 
  AND token = 'ezDUwjhlnACXcd8DbeGTPZ7yywbViwfWVAt6ji1ktSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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