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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc71125251f6074707dd9b3ee5c7f683ac545a206e7ad75bf2e229fa0b592a3' 
  AND token = 'c3Chmb6VTKf1wqPIYSijK+cjmMwDI1kNTQdNmX7ZCzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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