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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035810db43180f5d6f1fc08a3b6c101d195110ee6d6badce20098bcd15b63794' 
  AND token = 'Vcdsc4aDkbJXdal3gzPqGCJhSlvZQuFa0/7mR8Xx38g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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