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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c59602d7241c812fd16b4977fb76d3c1c3058e7d0113a57a63f1cc7be89506' 
  AND token = 'lCNYjGxsrGragtuSaIdNhSfGm6bDSpmtlqs6Kj6Z+S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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