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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9cececf7b53c4652620e85fed95d2af579be1f8b7cb7616743743522098eb7' 
  AND token = 'ARhy43MdYCrL15yUG5cXFr4S/hxzsYOBUZT5W0S8wTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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