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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ee8d99d710cf4d275780f804fa2f864615b02ddf7e1c01d7de5e8f5d99d4e6' 
  AND token = '3MW3iAWdLGK1vnTMNzykuQeWGPfm61uhzF38nEtIeVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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