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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5f628bea2bf84768c15e5d71770ceb79624aadfbd33beea83de544cbec5962' 
  AND token = 'jPyuQsrK1QnV88c/3auSYxcEjb+cHdi4Qc1y3RwxxqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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