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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8df25c43f47a763e8321ef9d863861029c1f5f44064ae132ae34d31d8ba501c' 
  AND token = 'J42OF+y1FKS1JD6yeb0BYbvwFr/zGmR7JxUsPJ66QHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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