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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1f0e6d290cc2c3a7b763dfeefe31d8054bc6e95fc92bbd8bd4e21aa2321e2e' 
  AND token = 'fK9bYA5Fu8ATEvM1R1A31oft7DtZY/odhsU220hfxdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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