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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6be99827dd93c0b8200c816c68fe25eb4525400cf433dd97561e07cef9e589' 
  AND token = 'h/7ASBKdag6TPftZqBbMtiU3GnnevfjdIZx2awa1XE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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