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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b34d085a9696a2f8c38394bc324aac5cb2b0c43cea9e52f836d336bcfcb24a' 
  AND token = 'IEAsftr3ostxH8cDc+d2/QhXMezVwyw02q2CHPnqd+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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