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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ebc977e1ac6363d923fde6967de1cd7990bd82a21c588b57f99d781fc09fe3' 
  AND token = 'F/0sBbXsVa1RKaRAx6HPafV5fnvn3DurFhOVmLQcYzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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