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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b926941f496ae7583bd929eed30620beae9a3b86d048863c89591596aeb0fe43' 
  AND token = '4YiJdP6Pm5IWsr2Bzk8GACMH1d/BJZqybcPEMwO0mBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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