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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3013640e18e26acf596617cfefaf2cb10247f8dcfce2807e1bad0ddd9f35a8f' 
  AND token = '4P9HcRyPR+3EfCVHJaPms8pRwYSc+KeoYWQsmzG+epA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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