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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcbec135e023fc90c03ca107b29de8c3b96a25d83dee9d61f891e444c8cdd5d' 
  AND token = 'za7l+/FH/pGF8VVafznalrpSQI31cJHGBp9aylVqGb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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