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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd956e527a1421d16216c52529d72e14e048382c2c41a89ee2a907541865f4039' 
  AND token = 'APOAUH0ufbfrEjfoSZH5Umt2YtONqNHObkwtgJMmhzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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