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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0489f2eddbd5d64f60f40cf656a0c9fdd872d53961552bd700e652e47e807a' 
  AND token = '2mlimfBmG87keAzbZtQb0G9zjunxaKCZ0Jr8ha0imtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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