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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2f6f1ccb2b08fd3e876b09bc371899b6cde0f21c21bfff4d077b19dbe768ab' 
  AND token = 'lQjVmW8Es2ZBq/lPhgpCczBbrV2hwWkeG6fHMwNQr0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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