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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f332fc7f15664465c93f37b253d74573f21dc041d9ec30d4eac1ac2a8be572b2' 
  AND token = 'rDXFa1TqBqpO66gnR95IV5yw74NY33vwLF+zn7mBL9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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