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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dcfd010f3e34271d891bf20d10a696ca70ca83d9b55a7e5eb5e289c4d62246' 
  AND token = 'udHxrEPPv5csbMj4Zh3FkwrMS095vZvZkJrlU2LiRjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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