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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f6ef24f8abb3bea5ed12b72425cdee1335c204cbe5a5b8fd4ceb0ebdbb716e' 
  AND token = 'dj5g0m9IYIV1DCVJ3+9+TUsGkp4/Y1v2Rku1PneRi0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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