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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d091e7aa0cce05fb5f24710ad552bd798c4dd5b2ef79b4e3625b2bbd8fe6e55' 
  AND token = 's3o4/BF6MijRafINp5qCbGIu6dGlzD+r7x/HbVidbQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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