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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899cffaf704fc93e49f4f2b832c813f907e7c52501e12ffb87eb233b3a55cde4' 
  AND token = '8bCiopYsYLXc9Cd2KCzydqLt9HS+mTV/BU4pbqvN/oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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