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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff050d72f8f0b1d3a78c6caeaa8a0c6812e4c3460bd3aefd477886095675539' 
  AND token = 'bCl41H+FIpOgfMkUKE4gIk0js6Xhao/BWfA7dHrkl8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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