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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2bf1340af51c909f0779e0b0ccc192bf8cd8a6414d94238dcf14cfdd99a95a' 
  AND token = 'l2Mwe1Z7pRdiowaDiM0jfxX1m3tik5uCAbscFAOJrx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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