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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb82fc2523b06f944c723a6e43508b880e128cbffeb500f6c648efe48815fab' 
  AND token = 'bE9o/tZzas0f3bUQOpKICCQRxEqQPy7PZavk8jlUDkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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