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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91f71f976b8f6531c1441ab02f259d63cdeb8439fd295cd3eace8282f36fbba' 
  AND token = 'sxPTDPi1MaWMmyS/km8Ju3JNa1imwSAPg5IUWXWsxYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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