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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67916c03ba6bd1597be95dd08613596a9a73052e9a9e472219abc53f1bb7f78' 
  AND token = 'C94y4ylGY5h2z9dYqC39H02JKB2xiYMAaltmUHBRD7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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