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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe5f8173a40ee504d0e8ffe1f9094a36e9b89c85df56a9bbde4a5bcf384984f' 
  AND token = '9gL/VCth0tHONbw1Wo3OVuDpVC+yGA5CQSr8RY9Wk80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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