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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da83ff0197438a8c3e2c836738a814132e9f220cdc09a989cc50f61f46eaa0c2' 
  AND token = 'TBNrE4NC6xPjn0JAIgvSpi+G7E2hwZqEcCc9Cg5Gm8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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