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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c854fb52d101d12e6a4766d3b850f8b289e7b0561dcaf99170b5317dd0bc28' 
  AND token = '+rIidZcaRnVVk/VE8klgW2Po16klMkciXIihqg1A8Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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