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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7106e65cc3f244f2cf6f04a244b563a44e16fd20b8dc401759595298805ec85' 
  AND token = 'c2q822OF9GQsOdU/2a6wSvRDEqyMDb9qebqko1RYJnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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