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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2337ab4540956e7cda09423d4b01913adebc81af04ad4e40b3e85a5a3e2e3a86' 
  AND token = 'ILn0GrHATuQceVCT2lcglgvN8XD+bjhcFnQyKgRMZAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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