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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd40b80c52939bcdfa267a11a323b09fdb95d91d0f0a53c537bb52c42f155847' 
  AND token = '91PbMH3f4Xh3+IJaOq36jbqcxJDoU/2IlLl6vJsg5us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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